Using bSphinx ulleted list in credentials docstring.

Author: dhermes

gcloud/credentials.py

@@ -26,10 +26,12 @@ def get_credentials():
  which uses this method under the hood.
 
  Checks environment in order of precedence:
- - Google App Engine (production and testing)
- - Env. var. GOOGLE_APPLICATION_CREDENTIALS pointing to stored credentials.
- - Stored "well known" file associated with ``gcloud`` command line tool.
- - Google Compute Engine production environment.
+
+ * Google App Engine (production and testing)
+ * Environment variable GOOGLE_APPLICATION_CREDENTIALS pointing to
+ a file with stored credentials information.
+ * Stored "well known" file associated with ``gcloud`` command line tool.
+ * Google Compute Engine production environment.
 
  The file referred to in GOOGLE_APPLICATION_CREDENTIALS is expected to
  contain information about credentials that are ready to use. This means